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Beaver Bv,. (1981). Maternal behavior in mares. Vet Med Small Anim Clin, 76, 315–317.
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Berger J,. (1981). The role of risks in mammalian combat: Zebra and onager fights. Z Tierpsychol 56, , 297–304.
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CLAYTON HM et al,. (1981). Some studies of comparative aspects of sexual behaviour in ponies and donkeys. App Anim Ethol, 7, 169–174.
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COUGOUILLE-GAUFFRETEAU B et al,. (1981). Research on the consequences of the injection of male hormones... Comptes red Seanc Acad Sci, 292, 1073–1076.
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Groves Cp, W. D. (1981). Studies on the taxonomy and phylogeny of the genus Equus. Mammalia, 45, 321–354.
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Grubb P,. (1981). Equus burchelli. Mammalia, 157, 1–9.
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Hoyt Df, T. C. (1981). Gait and the energetics of locomotion in horses. Nature, 292, 239–240.
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HUGHES RD et al,. (1981). Interactions between Camague horses and horseflies. Bull Entomol Res 71, , 227–242.
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Leblanc Ma, B. M. (1981). Mise au point d`une épreuve destinée de la reconnaissance du jeune par la mère chez chaval. Biol Beh, 6, 283–290.
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Prescott J,. (1981). Suckling behavior of Llama and Chapman's Zebra in captivity. Appl Anim Ethol, 7, 293–299.
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